Carrier operating and Service Manual download pdf (Page 12)

1--3

T--35603/11

1. Condenser Fan Motor (CM1)

2. Filter--Drier Outlet Valve

3. Filter--Drier

4. Ambient Temperature Sensor

5. Filter--Drier Inlet Valve

6. Condenser Fan Motor (CM2)

7. Receiver

8. Fusible Plug

9. Condenser Coil

10. Discharge Line Check Valve

11. Discharge Line Isolation Valve

12. Sight Glass

13. Moisture/Liquid Indicator

14. Discharge Pressure Transducer

15. Evaporator Fan Housing, Curbside

16. Discharge Line Connection

17. Suction Line Connection

18. Suction Pressure Transducer

19. Evaporator Fan Motor (EFM2)

20. Liquid--Suction Heat Exchanger(if fitted)

21. Heater Coil Assembly

22. Evaporator Fan Motor (EFM1)

23. Evaporator Fan Housing, Roadside

24. Auxiliary Cooler Suction Connection

25. Auxiliary Cooler Liquid Connection

Model/Serial

Number

Plate

23 22 21 20 1918 17

ROADSIDE

(RS)

CURBSIDE

(CS)

Figure 1-2. Unit Assembly -- Back View

1.2.3 Evaporator System

Theevaporatorsystem includestheevaporatorcoil,fan

andmotorassemblies,liquid--suctionheatexchanger(if

so equipped), heater coil assembly, a thermostatic

expansion valve, and condensate drain connections.

The thermostatic expansion valve meters the flow of

refrigerant entering the evaporator coil. The evaporator

coil provides heat transfer surface for transferring heat

fromaircirculatingovertheoutsidethecoil torefrigerant

circulating inside the tubes; thus providing cooling. The

liquid--suction heat exchanger absorbs heat from the

liquid refrigerant further heating the suction gas,

decreasing the possibility of liquid refrigerant from

returning to the compressor. The heating coils provide

heat transfer surface for transferring heat from engine

coolant water circulating inside the tubes to air

circulating over the outside surface of the tubes, thus

providing heating. The fans circulate the air over the

coils. The air filters remove dirt particles from the air

before it passes over the coils.

A heat valve controlsthe flowof enginecoolant waterto

the heating coils upon receipt of a signal from the

controller. The condensate drain connections provide a

means for connecting tubing for disposing of

condensate collected on the evaporator coils during

cooling operation.

1.2.4 Compressor Assembly

The compressor assembly includes the refrigerant

compressor, clutch assembly, suction and discharge

service valves, high pressure switch, low pressure

switch,suctionanddischarge servicing(charging)ports

and electric solenoid unloaders.

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Carrier operating and Service Manual Page 12

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